Get the list of Users currently using a published Application:

Get-XASession -BrowserName notepad | select AccountName

Get the computer(or client) name from where a Application is launched

Get-XASession -BrowerName notepad | select ClientName, AccountName

Logoff a user(user1) session who opened “MS Word” application in XenApp:

(Get-XASession -BrowserName “MS Word” -ServerName XenAPP1 | ? {$_.AccountName -match “User1″ }).SessionID | Stop-XASession

Get all published applications on a Server

Get-XAApplication -ServerName XenApp1 | select DisplayName

Get all Desktops published in XenApp environment

Get-XAApplication | ? {$_.ApplicationType -eq “ServerDesktop” } | select DisplayName

Get the users or groups who has permission to a published application:

Get-XAAccount -BrowserName App1

How to get the list of processes running in a given XenApp session on server:

Get-XASessionProecss -ServerName XenApp1 -Sessionid 10

So, here is the script I am talking about which takes application name as parameter and displays the XenApp servers where it is published, Accounts that have access to it, path of the application, Type of the application(streamed/serverInstalled), Executable path and many more details.

Note that you need to download and install Citrix XenApp 6 Powershell SDK to get the required SnapIns. This is not required if you are running the script from a XenApp server since it already contains the required Powershell SDK installation.

function Get-CitrixPublishedApplicationDetails {
[cmdletbinding()]
param(
[string]$AppName
)            

Add-PsSnapIn Citrix*
Get-XAApplicationReport -BrowserName $AppName | Select DisplayName, ServerNames, Accounts, ApplicationType, ClientFolder, CommandlineExecutable            

}

Usage:

Get-CitrixPublishedApplicationDetails -AppName Notepad

Hope this helps…

[update]

There is another way available as well which returns the list of XenApp Servers on which a given application is hosted.

Get-XAServer -BrowserName Notepad | select ServerName

ERROR Message:

Unexpected attribute ‘cmdletbinding’.
At line:24 char:15
+ [cmdletbinding <<<< ()] + CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException + FullyQualifiedErrorId : UnexpectedAttribute

When we will get this error?

This error we will generally observe when copy pasting a function from script to powershell console for quick execution. It is also quite possible that you might get this error while running some script or importing a function.

What are the causes for this error?

Mainly there are two cases where you will get this error.

Missing of param declaration:

We declare [cmdletbinding()] in a function or script but may miss to declare parameters after that. It is possible that your script/function doesn’t requires any parameters but you still need to declare it like param ( ). Otherwise you will get the above error.

So, it is general thump rule that [cmdletbinding()] should follow param() like below.

function foo-bar {
[cmdletbinding()]
param (
)
...
...
...
}

A new line between [cmdletbinding()] and param declaration:

Just try copy pasting the below code into a powershell window and let me know what happens. You will definitely observe the above given error. This is because of the new line between [cmdletbinding()] and param declaration. Now remove the new line and try again. It should go well.

function foo-bar {
[cmdletbinding()]            

param (
)
...
...
...
}

Note that above is true while copy pasting the code into powershell window. If you have this space in a script and you are executing the script from powershell window, then you may not notice this.

Hope this helps… Happy learning…

<#

    .Synopsis
        Get the list of scheduled Tasks from Windows 7 or Windows 2008 computers
        
    .Description
        This script displays all the scheduled tasks available in a windows 7 or windows 2008 computer.
 
    .Parameter ComputerName    
        Computer Name(s) from which you want to get the scheduled tasks information. If this
        parameter is not used, the the script gets the scheduled tasks list from local computer.
        
    .Parameter TaskName    
        Name of the scheduled task that you want to query. This is a optional parameter.
        
    .Example 1
        Get-ScheduledTask.ps1 -ComputerName Comp1, Comp2
        Get the scheduled tasks information from listed computers.
    .Example 2
        Get-ScheduledTask.ps1 -ComputerName Comp1 -TaskName "Calibration Loader"
        
        Get the details of given task from Comp1.
        
    .Notes
        NAME:      Get-ScheduledTask.ps1
        AUTHOR:    Sitaram Pamarthi
        WEBSITE:   http://techibee.com

#>
[cmdletbinding()]
param (
 [parameter(ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]
 [string[]] $ComputerName = $env:computername,
 [string] $TaskName
)
#function to get all scheduled task folder details.
function Get-TaskSubFolders {
[cmdletbinding()]
param (
 $FolderRef
)
$ArrFolders = @()
$folders = $folderRef.getfolders(1)
if($folders) {
 foreach ($folder in $folders) {
  $ArrFolders = $ArrFolders + $folder
  if($folder.getfolders(1)) {
   Get-TaskSubFolders -FolderRef $folder
  }
 }
}
return $ArrFolders
}            

#MAIN            

foreach ($Computer in $ComputerName) {
 $SchService = New-Object -ComObject Schedule.Service
 $SchService.Connect()
 $Rootfolder = $SchService.GetFolder("\")
 $folders = Get-Tasksubfolders -FolderRef $RootFolder
 foreach($Folder in $folders) {
  $Tasks = $folder.gettasks(1)
  foreach($Task in $Tasks) {
   $OutputObj = New-Object -TypeName PSobject
   $OutputObj | Add-Member -MemberType NoteProperty -Name ComputerName -Value $Computer
   $OutputObj | Add-Member -MemberType NoteProperty -Name TaskName -Value $Task.Name
   $OutputObj | Add-Member -MemberType NoteProperty -Name TaskFolder -Value $Folder.path
   $OutputObj | Add-Member -MemberType NoteProperty -Name IsEnabled -Value $task.enabled
   $OutputObj | Add-Member -MemberType NoteProperty -Name LastRunTime -Value $task.LastRunTime
   $OutputObj | Add-Member -MemberType NoteProperty -Name NextRunTime -Value $task.NextRunTime
   if($TaskName) {
    if($Task.Name -eq $TaskName) {
     $OutputObj
    }
   } else {
     $OutputObj
   }
  }            

 }            

}

Output:

Feel Free to post here if you have any trouble in using this script. Happy to help!!!

Since this is a split by white space operation, I tried below and got bit surprised with the output.

$string = "This is my test string"
$string.split(" ") 

Output:

The output is array which is containing the words plus some spaces in middle. This is not what I expected. After some struggle, I made it to work by using -Split.

Now the working code is…

$string = "This is my test string"
$array = $string -split "\s+"
$array

Output:

Hope this little tip helps. Visit to http://www.powershelladmin.com/wiki/Powershell_split_operator for more examples about using -Split.

[Update]:

The usage for -split is very simple and I believe this is a best suit for simple requirements like the one I showed you above. But if you have something more complex, then you may want to explore the usage of [regedit]::Split() dotnet method.

$TestPcNames = Get-QAComptuer -Id TEST* | select Name
$TestPCNames | % { write-host "$_.Name" }

There is nothing really wrong with the above code. All it contains is computer names but in object format. For that reason when he is trying to print the computer name, he is getting something like @{Name=TESTPC1}.Name

There he is stuck and now don’t know how to get list of computer accounts(in string format) in a array. This is very basic problem that every system administrator will face when trying to get their hands wet with powershell. I have also gone through this a couple of years back when I am studying ABCs of powershell.

The solution for this is very easy. First get the things printed correctly. You can use either of below one liners for that.

$TestPCNames | % { write-host "$($_.Name)" }         

$TestPCNames | % { $_.Name }

Once you seen them printed as string array(you will noted there won’t be any column header with work “Name”), all you need to do is assign the output to a variable.

$CompArray = $TestPCNames | % { write-host "$($_.Name)" }
$CompArray = $TestPCNames | % { $_.Name }

Now $CompArray contains the list of computers. Hope this little tip helps…

Thought of sharing with Scripting guys…

http://channel9.msdn.com/posts/PowerShell-V3-Guru-Don-Jones?goback=%2Egde_140856_member_112620896

When searched in google for this, I found a stackoverflow thread(http://stackoverflow.com/questions/2969321/how-can-i-do-a-screen-capture-in-windows-powershell) where different approaches are described to take a screenshot using powershell. I could make only one method working and the other is having problems. However, the working method has a limitation as I need to explicitly pass the width and height of the screen that has to be captured. If I am interested on whole screen, from where I can get these coordinates? My previous post(Get-ScreenResolution) came handy here. I read the screen resolution details using Get-Screenresolution.ps1 script and passed the output to the function I found in stackoverflow. Now it is working exactly the way I want.

For general usage, I made few more modifications to the code to allow explicitly pass the width and height details using -Width and -Height parameters. There is also another parameter called -FileName using which you can provide the name you want for the screenshot. Don’t provide a file extension here. The script saves the output in PNG format by default. If -FileName parameter is not specified you can see the output in %temp% with Screenshot.png name.

Get-ScreenShot.ps1

[cmdletbinding()]
param(
  [string]$Width,
  [string]$Height,
  [String]$FileName = "Screenshot"            

)            

#Function to take screenshot. This function takes the width and height of the screen that has
#to be captured            

function Take-Screenshot{
[cmdletbinding()]
param(
 [Drawing.Rectangle]$bounds,
 [string]$path
)
   $bmp = New-Object Drawing.Bitmap $bounds.width, $bounds.height
   $graphics = [Drawing.Graphics]::FromImage($bmp)
   $graphics.CopyFromScreen($bounds.Location, [Drawing.Point]::Empty, $bounds.size)
   $bmp.Save($path)
   $graphics.Dispose()
   $bmp.Dispose()
}            

#Function to get the primary monitor resolution.
#This code is sourced from 
# http://techibee.com/powershell/powershell-script-to-get-desktop-screen-resolution/1615            

function Get-ScreenResolution {
 $Screens = [system.windows.forms.screen]::AllScreens
 foreach ($Screen in $Screens) {
  $DeviceName = $Screen.DeviceName
  $Width  = $Screen.Bounds.Width
  $Height  = $Screen.Bounds.Height
  $IsPrimary = $Screen.Primary
  $OutputObj = New-Object -TypeName PSobject
  $OutputObj | Add-Member -MemberType NoteProperty -Name DeviceName -Value $DeviceName
  $OutputObj | Add-Member -MemberType NoteProperty -Name Width -Value $Width
  $OutputObj | Add-Member -MemberType NoteProperty -Name Height -Value $Height
  $OutputObj | Add-Member -MemberType NoteProperty -Name IsPrimaryMonitor -Value $IsPrimary
  $OutputObj
 }
}            

#Main script begins            

#By default captured screenshot will be saved in %temp% folder
#You can override it here if you want
$Filepath = join-path $env:temp $FileName            

[void] [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [Reflection.Assembly]::LoadWithPartialName("System.Drawing")            

if(!($width -and $height)) {            

 $screen = Get-ScreenResolution | ? {$_.IsPrimaryMonitor -eq $true}
 $Width = $screen.Width
 $Height = $screen.height
}            

$bounds = [Drawing.Rectangle]::FromLTRB(0, 0, $Screen.Width, $Screen.Height)            

Take-Screenshot -Bounds $bounds -Path "$Filepath.png"
#Now you have the screenshot

Usage:

Simple, just run the script from powershell window, you will see the output in %temp%\screenshot.png

Hope this helps… feedback welcome.

Write-EventLog : The source name “XXX” does not exist on computer “localhost”.

I am into similar situation today. What I was doing is trying to write a new event in to Application event log with a Event Source that is not already exists in the computer where I am trying. So the error message makes sense. It is saying the source I am trying to use, XXX doesn’t exists. So, how should get this added to list of available event sources in the computer so that it won’t through the error message again.

After little bit of googling, I found the below method promising.

New-EventLog -LogName Application -Source “XXX”

This command creates a new event source in Application Event log with the name XXX. All I need to do is just use this command once and try the write-EventLog cmdlet with the same source name(XXX). It worked this time.

Hope this little trick helps you…

[Update]

There are some dotnet ways available as well to see if a given source is available in EventLog and create one if needed.

To check if the source exists:

PS C:\> [system.diagnostics.eventlog]::SourceExists(“XXX”)
False
PS C:\>

To create a new source entry in event log:

[system.diagnostics.EventLog]::CreateEventSource(“XXX”, “Application”)

Code:

function Get-ScreenResolution {
[void] [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [Reflection.Assembly]::LoadWithPartialName("System.Drawing")
$Screens = [system.windows.forms.screen]::AllScreens            

foreach ($Screen in $Screens) {
 $DeviceName = $Screen.DeviceName
 $Width  = $Screen.Bounds.Width
 $Height  = $Screen.Bounds.Height
 $IsPrimary = $Screen.Primary            

 $OutputObj = New-Object -TypeName PSobject
 $OutputObj | Add-Member -MemberType NoteProperty -Name DeviceName -Value $DeviceName
 $OutputObj | Add-Member -MemberType NoteProperty -Name Width -Value $Width
 $OutputObj | Add-Member -MemberType NoteProperty -Name Height -Value $Height
 $OutputObj | Add-Member -MemberType NoteProperty -Name IsPrimaryMonitor -Value $IsPrimary
 $OutputObj            

}
}

Output:

Hope this helps…